Lighting-fixture.



T. w. RO LPH. I LIGHTING FIXTURE. APPLICATION FILED JU LY l7, 19H.

Patenfed Apr. 9. 1918.

FIG. 1

I fly YENTUH WITNESSES.

m Wm L. N 0 m an A 5 7 m m W w H/v W MA W ES PATENT OFFICE.

THOMAS W. ROLPH, OF CLEVELAND, OHIO, ASSIGNOB. TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

LIGHTING-FIXTURE.

Application filed July 17, 1914.

are suitable for outdoor or other lighting in which the light. isdistributed over a comparatively wide area. My invention is particularlyapplicable for use in connection with light sources of a more or lessconcentrated nature. such as concentrated filament incandescent lamps ofhigh efficiency. The

'object of my invention is to produce a device which will shield anobserver as much as possible from the direct rays from the light source,

ciency of the fixture as a whole.

According to my invention, I provide a shield consisting of asubstantially circular band which isspaced from the lamp bulb or otherholder for the light source. This shield is non-transparent, beingpreferably opaque, although it may be somewhat translucent- Its depthwill depend upon its proximity to the light source. An important objectof the invention is to shield the eyes of the observer from those rayswhich are ordinarily directed in a horizontal or substantiallyhorizontal direction. When the lamp is Viewed from a distance these rayscause serious annoyance to an observer, especially when the light sourceis very powerful. It will be apparent that the closer the shield is tothe light source the less should be its depth, on account of the greaternumber of rays which will be intercepted by it. The shield is disposedopposite to the light source, being preferably so placed that ahorizontal plane passing through the center of the light sourc willsubstantially bisect it. In other words, the shield should be insubstantial horizontal alinement with the light source; It is preferablethat the shield be of such contour that it will reflect downward therays it. intercepts and, to this end, it is also referable that theinner surface of the shie d have good reflecting properties, which maybe secured by making it of a light color.

Specification of Letters Patent.

and which at the same timewill not interfere substantially with theeiii- Patented Apr. 9, 191 8.

Serial No. 851,499.

My invention will be more clearly understood by referring to theaccompanying drawing, in which Figure 1 is an elevation, partly insection, 011 an enlarged scale, of a shield comprising my invention, andFig. 2 is an elevation, partly in section, of a complete fixture,including the said shield.

In the drawing, 10 is a shield or band composed preferably of metal 01'other opaque material. The inner surface of the said shield ispreferably of a light color, such as white, which will give it goodreflecting properties. The shield 10 is supported by means of thinstraps 11 connected to an upper ring 12. As shown in Fig. 2, the shieldis supported by a suitable removable attachment 13 to an insulating cap14 forming part of an outdoor fixture. It is to be understood, however,that this is only one exampleof the use to which my invention may beput, and that it may be applied tp any of the well-known fixturesupporting means. As shown in the drawing, my invention is used inconnection with an electric incandescent lamp 15, such as that describedin Langmuir application, Serial No. 762,327, filed April 19, 1913, andhaving a concentrated metal filament 16. The shield 10 should beopposite to or, more exactly, should be in substantial horizontalalinement with the light source 16. When used with a lamp such as thatshown in the drawing, good results have been obtained with a shieldapproximately ten inches in diameter and having a depth of approximatelytwo inches. The vertical curvature of the shield 10 is preferably suchthat it will direct downwardly the rays received from the light source16. Mounted above the shield 10 and preferably held by the removableattachment 13 .i s When used in connection with outdoor and similarlighting this reflector should'be of such shape that a wide.distribution of the light received by it will be obtained. Preferably.it is of metal and the inner surface is of a light color.

It will be apparent, from-the above derefiector 17.

scription, that theshield 10 will serve to tially horizontal rays sentout from the light source are those which cause the most nnoyance,because they can be seen from a great distance. The other rays are notencountered unless the observer looks upward at the light source. Itwill also be apparent that the efiiciency of the fixture is notsubstantially afi'ected. The supports for the shield 10 are of such anature that they'furnish a very slight obstruction to rays from On theother hand, the

the light source. fact that the shield directs downwardly thesubstantially horizontal rays intercepted by it adds somewhat to theefiiciency of the fixture.

Various changes and modifications of the above described apparatus Willreadily occur to those skilled in the art and are to be considered ascoming within the scope of my invention.

lVhat I claim as new and desire to secure by Letters Patent of theUnited States, is

1. In a lighting fixture, the combination of a concentrated light sourceand a narrow non-transparent band surrounding said light source, saidband being of such dimensions and so disposed as to intercept only thesubstantially horizontal light rays emitted from said source.

2. In a street lighting fixture, the combination of a concentrated lightsource and a non-transparent band surrounding saidlight source, saidband being of such dimenslons andso disposed as to intercept only thesubstantially horizontal rays emitted tially horizontal rays emittedfrom said light source, and areflector mounted above said light source.I

4. In a lighting fixture, the combination of a concentrated lightsource, a non-transparent band surrounding said light source,

. said band being of such dimensions and so disposed as to interceptonly the substantially horizontal rays emitted from said light source, areflector mounted above said light source, and straps connecting said reflector with said band.

5. In an outdoor lighting fixture, the com bination with a concentratedlight source and a reflector of a non-transparent band to intercept onlythe substantially horizontal rays emitted from the said light source.

In witness whereof, I have hereunto set .my hand this 15th day of July,1914. If

THOMAS W. RoLrH.

Witnesses:

J. E. KEWLEY, J. H. ANDERSON.

